xBIM 高级01 IFC多模型合并

• 2019 年 10 月 4 日
• 筆記

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多模型合并可以实现以下功能：

• 覆盖多个模型以表现得像一个模型
• 统一访问数据，就像它是单个模型一样
• 只读。要修改模型的内容，您必须使用特定模型
• 不限于单个模式（联合IFC2x3 + IFC4→将其作为IFC4接口查询）
• IFC联合可以存储为单个IFC文件（在IfcStore中）

using System;  using Xbim.Common.Step21;  using Xbim.Ifc;  using Xbim.Ifc4.Interfaces;    namespace BasicExamples  {      public class FederationExample      {          public void CreateFederation()          {              var editor = new XbimEditorCredentials              {                  ApplicationDevelopersName = "You",                  ApplicationFullName = "Your app",                  ApplicationIdentifier = "Your app ID",                  ApplicationVersion = "4.0",                    EditorsFamilyName = "Santini Aichel",                  EditorsGivenName = "Johann Blasius",                  EditorsOrganisationName = "Independent Architecture"              };              using (var federation = IfcStore.Create(editor, IfcSchemaVersion.Ifc4, XbimStoreType.InMemoryModel))              {                  federation.AddModelReference("SampleHouse.ifc", "Bob The Builder", "Original Constructor"); //IFC4                  federation.AddModelReference("SampleHouseExtension.ifc", "Tyna", "Extensions Builder"); //IFC2x3                    Console.WriteLine($"Model is federation: {federation.IsFederation}");                  Console.WriteLine($"Number of overall entities: {federation.FederatedInstances.Count}");                  Console.WriteLine($"Number of walls: {federation.FederatedInstances.CountOf<IIfcWall>()}");                  foreach (var refModel in federation.ReferencedModels)                  {                      Console.WriteLine();                      Console.WriteLine($"    Referenced model: {refModel.Name}");                      Console.WriteLine($"    Referenced model organization: {refModel.OwningOrganisation}");                      Console.WriteLine($"    Number of walls: {refModel.Model.Instances.CountOf<IIfcWall>()}");                  }                    // 保存为单一文件，工其他场景下使用                  federation.SaveAs("federation.ifc");              }          }      }  }

控制台输出如下所示：

Model is federation: True  Number of overall entities: 50303  Number of walls: 8        Referenced model: SampleHouse.ifc      Referenced model organization: Bob The Builder      Number of walls: 5        Referenced model: SampleHouseExtension.ifc      Referenced model organization: Tyna      Number of walls: 3

保存为IFC文件的联合设置如下所示。这个惯例纯粹是我们的发明，所以它不适用于其他工具。但它允许您在系统中创建联合，并在需要时再次重新打开它们。

ISO-10303-21;  HEADER;  FILE_DESCRIPTION ((''), '2;1');  FILE_NAME ('', '2016-10-27T13:14:43', (''), (''), 'Xbim File Processor version 3.2.0.0', 'Xbim version 3.2.0.0', '');  FILE_SCHEMA (('IFC4'));  ENDSEC;  DATA;  #1=IFCACTORROLE(.USERDEFINED.,'Original Constructor',$);  #2=IFCORGANIZATION($,'Bob The Builder',$,(#1),$);  #3=IFCDOCUMENTINFORMATION('1','SampleHouse.ifc',$,$,$,'XbimReferencedModel',$,$,#2,$,$,$,$,$,$,$,$);  #4=IFCACTORROLE(.USERDEFINED.,'Extensions Builder',$);  #5=IFCORGANIZATION($,'Tyna',$,(#4),$);  #6=IFCDOCUMENTINFORMATION('2','SampleHouseExtension.ifc',$,$,$,'XbimReferencedModel',$,$,#5,$,$,$,$,$,$,$,$);  ENDSEC;  END-ISO-10303-21;